Manually edit the following file to include the Portal server’s host name. "<a href="file:C:/Program" target="_blank">C:\Program</a> Files\ArcGIS\Server\GeoEvent\etc\com.esri.ges.arcgis.local.cfg"Assuming a standard port usage, modify only the third line "arcgis.host = " to include the machine's name such as "arcgis.host = portalmachinename".